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Tracing the Paleo sulfate-methane transition zones and H2S seepage events in marine sediments: An application of C-S-Mo systematics

DRS at CSIR-National Institute of Oceanography

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Title Tracing the Paleo sulfate-methane transition zones and H2S seepage events in marine sediments: An application of C-S-Mo systematics
 
Creator Peketi, A.
Mazumdar, A.
Joshi, R.K.
Patil, D.J.
Srinivas, P.L.
Dayal, A.M.
 
Subject sediments
methane
transition element compounds
seepages
 
Description Microbially mediated anaerobic oxidation of methane (AOM) coupled with sulfate consumption within the sulfate methane transition zone (SMTZ) in marine sediments is a widely recorded biogeochemical reaction and has profound influence on the atmospheric CH sub(4) budget, marine carbon cycle and composition of sediment pore fluids. Recognizing the paleo-SMTZs in the marine sediments/rock records can throw light on the variation of paleo-methane fluxes and occurrences of cold seep (H sub(2)S + CH sub(4)) events through geologic time. Here, we present results from carbonate carbon, pyrite sulfur and molybdenum analyses for two sediment cores overlying the methane hydrate deposits in the Bay of Bengal. The results show intimate association of isotopically depleted carbonate carbon and enriched pyrite sulfur, constraining the paleo SMTZ within the sediment column. In addition, anomalous enrichments of Mo concentrations indicate hydrogen sulfide seepage events. Here, we propose a geochemical tool using C-S-Mo systematics to decipher the paleo-SMTZs in marine sediments and rocks.
 
Date 2012-11-02T09:31:59Z
2012-11-02T09:31:59Z
2012
 
Type Journal Article
 
Identifier Geochemistry Geophysics Geosystems, vol.13; 2012; Q10007, 11pp
http://drs.nio.org/drs/handle/2264/4194
 
Language en
 
Rights An edited version of this paper was published by AGU. Copyright [2012] AGU. To view the published open abstract, go to http://dx.doi.org/10.1029/2012GC004288
 
Publisher American Geophysical Union